With this transport, we can put the spam mails to the .Spam folder within $HOME/.maildir. If you use the IMAP protocol, then you can simply check the spam mails by accessing Spam folder. But with POP3 protocol there’s no way to check it. So if you use POP3 then use the header filtering rules of client software instead.

And we also need to add a router which uses this transport. The order is important in here too. I put it below the bogofilter router.

The name of router/transport is located after R= and T= . The name of router appears after R=, and the name of transport appears after T=. According to this log, we can say that removespam or procmail router is used after the bogofilter excuted.